4 Answers
4

If you want to try ubuntu it offers this as an option during the standard install. If you want to do it manually select the try ubuntu from the live CD then use gparted to do it. Obviously this is only possible if you have sufficient free space on your hard drive. I'd also recommend defragmenting before you start.

With Unity (standard in ubuntu 11.04) you'll find this by just pressing the windows key and typing gparted. If you use and older livecd it's in the system menu under administration.

You may want to use Easus Partition Manager. I have used the tool more than once and it has not failed me anytime. There are more options/answers on this topic in below link which you may want to look.